C语言实现socket简单通信实例

前端技术 2023/09/07 C++

本文实例讲述了C语言实现socket简单通信的方法，分享给大家供大家参考。具体实现方法如下：

服务器端代码如下：

/*
============================================================================
Name : server.c
Author : king
Version :
Copyright : Your copyright notice
Description : Hello World in C, Ansi-style
============================================================================
*/
#include <stdlib.h>
#include <pthread.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h> /* inet(3) functions */

#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

int handle(int point);

int main(void) {
int sfd, ind;
struct sockaddr_in addr;
struct sockaddr_in clent;
char resv[1024], sendbuf[1024];
char buf[1024];
char * myaddr = \"192.168.231.128\";

int ret; // 返回值设置
socklen_t lent;
int pid;
addr.sin_family = AF_INET; //IPv4 Internet protocols

addr.sin_port = htons(5050); //这里输入服务器端口号

addr.sin_addr.s_addr = inet_addr(myaddr);
; //INADDR_ANY表示本机IP

//獲取socket描述符，IPV4asd
printf(\"socket start \\n\");
sfd = socket(AF_INET, SOCK_STREAM, 0);

if (sfd < 0) {
printf(\"socket error \\n\");
return -1;
}
printf(\"bind start \\n\");
//将套接子与指定端口链接
if (bind(sfd, (struct sockaddr *) &addr, sizeof(struct sockaddr)) < 0) {
printf(\"bind error \\n\");
return -1;
}

//监听套接子
printf(\"listen start \\n\");
if (listen(sfd, 1024) < 0) {
printf(\"listen error \\n\");
return -1;
}

for (;;) {
//接受来自客户端的信息
printf(\"accept start \\n\");
memset(&clent, 0, sizeof(clent));
lent = sizeof(clent);
ind = accept(sfd, (struct sockaddr *) &clent, &lent);
if (ind < 0) {
printf(\"accept error %d \\n\", ind);
return -1;
}

printf(\"infor \\n\");
printf(\"clent addr%s porit %d\\n\",
inet_ntop(AF_INET, &clent.sin_addr, buf, sizeof(buf)),
ntohs(clent.sin_port));

pid = fork();

if (pid == 0) {
//子进程
close(sfd);
handle(ind);
} else if (pid < 0) {
//error
close(ind);
} else {
//父进程
}
}

return EXIT_SUCCESS;

}

int handle(int point) {

int retn;
char buf[1024];

for (;;) {
retn = read(point, buf, sizeof(buf));
if (retn < 0) {
printf(\"read error \\n\");
close(point);
break;
} else if (retn == 0) {
printf(\"client exit \\n\");
close(point);
break;
}

printf(\"client:%s\\n\", buf);

if (strcmp(\"exit\", buf) == 0) {
printf(\"exit \\n\");
close(point);
return 0;
}
}
return 0;
}

客户端代码如下：

/*
 ============================================================================
 Name    : client.c
 Author   : king
 Version   :
 Copyright  : Your copyright notice
 Description : Hello World in C, Ansi-style
 ============================================================================
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>    /* inet(3) functions */

int handle(int fd);

int main(void) {

  int nsd;
  char buf[1024];

  char * myaddr = \"192.168.231.128\";
  struct sockaddr_in addr;

  printf(\"welcome to echo client\\n\");
  nsd = socket(AF_INET, SOCK_STREAM, 0);
  printf(\"connect start1 \\n\");
  //bzero(addr, sizeof(*addr));
  memset(&addr,0,sizeof(addr));
  printf(\"connect start2 \\n\");
  addr.sin_family = AF_INET;
  addr.sin_port = htons(5050);
  addr.sin_addr.s_addr=inet_addr(myaddr);

  printf(\"connect start3 \\n\");
  if (connect(nsd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) < 0) {
    printf(\"connect error \\n\");
    return -1;
  }

  sleep(5);
  printf(\"handle start\\n\");
  handle(nsd);
  close(nsd);
  return EXIT_SUCCESS;
}

int handle(int fd) {

  char sendl[1024], rev[1024];

  int retn;

  for (;;) {

    memset(sendl,0,sizeof(sendl));
    memset(rev,0,sizeof(rev));
    if (fgets(sendl, 1024, stdin) == NULL) {
      break;
    }
    //
    printf(\"wirte start\\n\");
    write(fd, sendl, strlen(sendl));
    read(fd, rev,strlen(rev));

  }

  return 0;
}

注意：
int connect(int sockfd, const struct sockaddr *addr,socklen_t addrlen);
记住一定是值 addrlen
accept   socklen_t *addrlen要是一个指针

希望本文所述对大家C语言网络程序设计的学习有所帮助。

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